DVB-T2

DVB- T2 is the successor standard to DVB -T. The acronym stands for the English term Digital Video Broadcasting Terrestrial ( to German as: Digital earthbound television) and refers to the terrestrial ( ground-based ) distribution of digital radio, television and data signals in the Earth's atmosphere. DVB -T2 is distinguished from its predecessor by a higher efficiency.

  • 3.1 Germany
  • 3.2 Austria
  • 3.3 France
  • 3.4 United Kingdom
  • 3.5 Italy
  • 3.6 Other Countries

Characteristics of DVB- T2 / advantages over DVB- T

The commercial demands on the system are in a document of the industry-led consortium DVB defined as follows (excerpt):

  • Focus on stationary reception, but mobile and portable reception should be possible
  • Improve the robustness of the signal
  • Increasing the size of single-frequency networks by at least 30 percent
  • Improving usability with faster switching times
  • More cost-effective distribution through more efficient use of spectrum
  • With the same bandwidth demand more programs can be sent simultaneously with better quality. The transmission of high definition TV HDTV is possible.
  • Robustness variable configurable per service
  • Transmit diversity ( better care through two transmit antennas - Multiple Input Multiple Output - concept )
  • Defines various bandwidths
  • Steeper drop in the spectrum edges

Technology

In September 2009, the DVB-T2 standard from the European Telecommunications Standards Institute (ETSI ) under EN 302 755 V.1.1.1 has been published.

  • Terms of COFDM as a modulation method: In addition to the well-known DVB- T 2K and 8K modes, a 16K or 32K mode can be used, which allows for greater frequency networks. In addition, the 16K and 32K FFT mode with the same size of the single-frequency network allows a relatively shorter guard interval, which leads to increased user data rate.
  • Use of 256- QAM: today QPSK, 16- QAM and 64- QAM are used for DVB -T. They allow the transfer of 2, 4 or 6 bits per symbol. However, DVB-T2 will also receive an option for 256-QAM, which allows transmission of 8 bits per symbol. The time this takes increased signal strength is partially offset by the new forward error correction.
  • New Forward Error Correction: Using new error correction mechanisms can be the required signal strength for error-free reception significantly reduced. The choice fell on a code of group of LDPC codes (low- density parity -check code ).
  • Terms of MISO Technique: MISO (Multiple Input - Single Output ) uses multiple transmit antennas for transmission. By taking advantage of special channel properties, the robustness of the signal can be considerably increased.

On 3 June 2008 a datasheet in the DVB group has been published. The standard was ratified in June 2008 by the Steering Committee. The main technical differences between DVB -T and DVB -T2 are summarized in the following table, in bold the additional options for DVB- T2:

Compatibility with DVB- T

DVB -T2 omitted for backward compatibility with DVB -T, as it would reduce the efficiency of the new system. A DVB -T device can therefore not receive DVB -T2 signals. However, many DVB -T2 devices Conversely also can receive DVB -T signals, because the manufacturer will combine the DVB-T2 with a DVB -T receiver.

Use of new image compression method

The use of current video compression techniques, such as MPEG -4 AVC ( H.264) or High Efficiency Video Coding ( H.265 ) is meaningful, since anyway the new hardware must be used. However, the video compression process is not a part of the DVB - T2 standard, as the DVB- T2 standard only defines the physical layer transmission.

Dissemination

Germany

In Germany there is a DVB-T2 pilot project for testing purposes in the Hamburg area ( Lüneburg, Rose Garden ). The project partners are convinced that the strengths of the terrestrial television can be further expanded with an introduction of DVB- T2. Therefore, in addition to technical testing and a corresponding implementation for this scenario is developed. With an introduction of the new standard DVB -T2 is earlier than anticipated in several years.

There was also a test in space Freimann in Munich by the IRT.

The ZDF is already in view to disseminate high-definition television terrestrial and currently is the capacity but not sufficient. "In a few years," but this could be possible with the introduction of improved transmission and coding technologies.

ARD and ZDF want from the year 2017Vorlage: Future / In 3 years on DVB -T2 change, the transition to be completed by 2020.

Austria

In 2006, when DTT was introduced across the board and the analog signal replaced, the DVB-T2 technology saw the network operator ORS, a subsidiary of the ORF, as not yet mature enough to. That's why we opted for DVB- T as a first step, on 12 April 2010 were given the start of a DVB-T2 test operation known in Vienna. Since 2011, the operation will be tested in the single-frequency network (channel 65) with a second transmitter in the arsenal. Trial operation should run until March 2012, but was extended for one year in April 2011, also in 2011, a transmitter at a second frequency (channel 60) was put into operation on Bald Mountain, also on the additional services have been tested. The experimental factory of the channels 60 and 65 2012 was extended until 31 March 2013.

In July 2011, the operator of MUX MUX D and E was tendered on which nationwide DVB -T2 should be sent in each case. In April 2012, was also advertised MUX F due to the demand.

DVB -T2 was launched on April 15, 2013 under the name SimpliTV. Up to 40 Austrian and German TV channels are available.

France

The control functions of multiplexing in the DVB-T2 standard is expected in 2015.

Great Britain

The BBC began on 27 June 2008 with DVB-T2 test transmissions from the transmitting location Guildford southwest of London.

On 2 December 2009 began in the UK the rule radiation in the DVB -T2 standard.

Italy

The pay- TV provider Europa 7 was launched in 2010 in control mode almost nationwide on VHF channel 8. The encrypted offer is mostly in HD.

Other countries

In Sweden, free and pay - TV is available in this standard.

Czech Republic, Slovakia and Serbia to test the new norm.

In Denmark, started broadcasting via DVB -T2 on 1 November 2009. To receive was the private TV (Boxer) on MUX 3-5 and the new state program DR HD on MUX 2 other state and local TV programs on MUX 1 sent initially continue to DVB- T, but have been on January 11, 2012 also switched to DVB- T2.

In Kenya there are at the moment and DVB -T2 packages KBC, along with pay movies.

In Namibia was beginning of July 2012, started the first country in southern Africa, with a GOTV DVB -T2 service.

It is expected that countries that do not have established no DVB -T, probably already want to use DVB- T2.

BCH-Code Discrete Fourier transform Pilot signal Kahlenberg Transmitter DVB-CPCM
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